The level of protein structure in which combinations of secondary protein structures (ALPHA HELICES; BETA SHEETS; loop regions, and AMINO ACID MOTIFS) pack together to form folded shapes. Disulfide bridges between cysteines in two different parts of the polypeptide chain along with other interactions between the chains play a role in the formation and stabilization of tertiary structure.

Synonyms: Protein Structure, Tertiary, Tertiary Protein Structure, Protein Structures, Tertiary, Tertiary Protein Structures